Eto naman ang explanation kung baket. I got this sa yahoo Answers:
when hi(s) dad tried to choke him he gave lelouch the immortality geass code. hence the whole title code geass
wait heres a better explanation
Lelouch is still alive. He has Charles’ Code which he received when the man choked him. The Code activates first when you die, which happened. And before you say can’t have Code and a Geass at the same time, the Code wasn’t the one C.C. had, meaning that Lelouch was the first one to achieve Code Geass. He’s now travelling the country-side with C.C., living as immortals.
That’s the only reason for C.C. to be suddenly so happy again. Also, before you say that C.C. was just talking to the dead like with Marianne, that’s not true. She could only talk to her because of the nature of her Geass which allowed her to implant herself into the “hearts” of others. That’s how she was able to talk with Marianne. Lelouch’s Geass was entirely different, meaning that she could only have spoken to him if he was there.
Also, the screenie of the cart driver who is masking his features competely supports this.
What further supports this is that Nunnally got Lelouch’s memories when she touched her, just like Lelouch did when he touched C.C. back in Narita. The only way this could have happened is his Code activating. This pretty much confirms that he has the Code and is alive.
C.C.’s words in the end translated: “Geass is the power of kings, it will isolate you… well, I guess thats a little wrong… eh, Lelouch”
The statement above answers the argument that I had before. Kung dalawa yung code na nageexist, at nagdisappear na si Charles vi Britannia, san napunta yung Code nya? Natransfer nga kay Lelouch yung Code. One thing though yung hindi pa napapatunayan. Na may Code Geass na si Lelouch. Ang sabi ni C.C. Pag nakuha mo yung Code mawawala yung Geass powers mo. I still haven't seen Lelouch while having the Code and still was able to use his Manipulation Geass. Of course, hangga't hindi lumalabas yung R3. All of these are just speculations.